Door-lock



(Model.) 3 SheetsSheet 1. J. J. HELSING.

7 DOOR LOCK. No. 282,517. Patented Aug. '7, 1883.

y INVENTEIRI 0w $60 iZW Pawns, Ppnlo-Lvlhompbar. Washington. 0. c.

(ModeL) 3 Sheets-Sheet 2.

J. J. HELSING.

DOOR LOOK. No. 282,517. Patented Aug. 7, 1883.

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\Model.) 3 SheetsSheet 3.

J. J. HELSING.

" DOOR LOOK.

N0. 282,517. I Patented Aug.- '7, 1883.

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WITNESSES; INVENTELR 074404 0 634 p? I, Wfi O M U ITED STATES PATENTCFFICE.

DOOR-LOCK.

SPECIFICATION forming part of Letters Patent No. 282,517, dated August'7, 1883,

Application filed December 8, 1882. (Model) State of California, haveinvented certain new,

and useful Improvements in Compound Door- Locks, of which the followingis a specification.

My invention relates to improvements in rim or mortise door-locks; andthe objects of my invention are, first, to provide a lock adapted to beused either as an ordinary door-lock or as a burglar-proof look, as theoccasion may require, and, second, to provide a lock adapted to beoperated by two separate keys, one of which shoots the bolt and theother operates a mechanism by which the bolt is held in its lockedposition. 'I attain these objects by the mechanism illustrated in theaccompanying drawings, in which Figure 1 represents a side view of mycompound look, a side plate being removed to show the internalmechanism. Fig. 2 is a top view of the spring-latch. Figs. 3, 4, and 5are side views showing the locking mechanism in different positions.Fig. 6 is a sectional top view, showing the locking-bolt. Figs. 7 and 8are side views of the two keys. Fig. 9 is a cross-section of the outerward on one key.

Similar letters of reference are used to designate like parts throughoutthe several views.

The casing A of my lock is made much in the usual manner.

At the bottom of the case I place an ordinary spring-latch, B, operatedby a knob, C.

' The boltD is provided upon its under side with two lugs, E and F, andhas two bearings or points of support, one in the slot of the frontplate and the other in the slot of the back plate. It is also providedwith a stud, G, which limits its forward throw.

Upon the upper edge or surface of the belt I out three notches ormortises, H, I, and J, of varying width and depth. The rearmost notch, Jis engaged by the tumbler K, pivoted to the pin L and operated by thelower key, and held. in place by the spring M, attached to the backplate of the lock. The notch I is adapted for the reception of the lowerportion of the catch or tumbler N, (which in form somewhat resembles thecross-section of an iron channel-beam,) the lower face of the upperflange resting upon the outer end of a lever, O, pivoted on a pin, 1.

Immediately over the pin 1?, I place a fixed stud, Q, which carries abow-spring, B, one end of which presses upon the upper face of the topflange of the tumbler N, and the other end presses down upon the innerend of the lever O, and thus the upper end of the tumbler is keptgripped between the spring and lever. The tumbler N isheld in a verticalpo sition between two guides, Sand T, as shown.

The notch II receives the tumbler or bar U, which slides up and downbetween the front plate of the lock and the guide-plate T. The

.free end of the spring V, attached to the top which are of any suitableform, and attached to the casing in any well-known manner.

Having thus fully and accurately described the construction of mycompound door-lock, I will now proceed to describe the operationthereof. 7

When the door is unlocked, or only upon the latch, the position of theparts will be such as represented in Fig. 1. Should it be desirable tolock the door or shoot the bolt, so

that it may be easily withdrawn by means of the same key, I insert a key(from the side facing the operator) and turn it to the right until thebridge-ward strikes against the lug E and moves it into the positionshown in Fig. 3, and upon continuing to rotate the key it will bebrought around to the key-hole and may be withdrawn. Should it bedesirable to withdraw the bolt from this position, the key is againinserted and turned to the left. It will now clear the lug E and strikeagainst the lug F and the bolt will be moved backward for a shortdistance. After the key clears the lug, it should be moved around againuntil it strikes against the lug E, when the backward movement of thelocking-bolt may be completed and the door opened. Should it benecessary to firmly secure the door and lock the bolt in place, themotions necessary to throw the bolt into the position shownin Fig. 3 arefirst gone through with, but after the key clears the first lug, IE, itis turned until it strikes upon. the second stud, F, and the bolt ismoved forward until the slot I is beneath the tumbler N, which will beforced dow nward by the spring 1 into the said notch I, while at thesame time the catch or lug of the tumbler R will. drop into the notch J,and the position of the parts will be such as is represented in Fig. 4.,and it will be impossible to withdraw the bolt by the operation of thekey which shot it in place. As a further guard. against tampering withthe lock, I now insert the second key at the upper key-hole and turn itto the right until it strikes the under curved surface of thespring-pawl B, and, by causing it to pivoton thepin O,will release thelip of the part from Contact with the shoulder Z of the sliding arm, andthe spring 'V, by pressing down upon the tumbler U,will cause it todescend and enter thenotch H- The key may now be turned in the samedirection until it is aligned with its key-hole,when it may be withdrawn. \Vhen it becomes necessary to withdraw the bolt, a key isinserted .in the upper key-hole and turned to the left until it engageswith the shoulder A of the sliding arm Y and draws it backward, at thesame time raising the tumbler U from the slot H in the bolt. hen the armY has been retracted a suiticient distance, the clip end of thespring-pawl B will be raised up and engage with the shoulder Z, andthereby hold the arm Y and tumbler U in a retracted position. The key isnow rotated in the same direction until the operator discovers, eitherby a clicking sound orbythe sense of touch, that the keyhas passed thepoint of the lever 0. He then reverses the movement of the key andpresses down upon the sharp point (1 ol' the lever O, andv when thelever has been moved sut'ticiently to lift the catch or tumbler N out ofthe notch I the sharp point a will spring into the groove 7) intheln-idge-ward or outer edge ol'the key, (shown in Figs. 8 and 9,) andin so doing will make a sharp c1ick,which will warn the operator thatthe catch N has been raised to the required height.Theboltisnowinapositiontobeaetcd upon by akey inserted through the lowerkeyhole and turned to the left,which, first striking upon the under sideof the outer end of the tumbler K, raises it up from out the notch J.The key is then turned till it strikes the lug F, when the bolt may bepartially drawn back. The key is then made to perform anotherrevolution, and, striking against the lug I withdraws the bolt. Bothkeys may now be removed l'rom the lock and the door he left upon thelatch.

A lock constructed as above described will be very diffi cult, it notimpossible, to pick, and may be used in locations and undercircumstances where a combination-lock would not be available.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

In a compound door-lock, thecombinal-i on of the bolt 1), having lugs EF, notches .I I II, and stop-pin G, the tumblers K N U, adapted, res 1)ectivel y, to engage with said. notches, the pivoted lever O, andspring It, for gripping the ttnnbler N, the sliding arm Y, havingshoulders A Z, the pawl. B, and spring IX, for controlling the movementsof said sliding arm, the spring V, adapted to actuate the tumbler U, andthe flexible band \V, connecting said tumbler to the sliding arm,substantially as shown and described.

In testimony that I claim the foregoing l have hereunto set my hand andseal.

J. JONAS ITIGLSI'NU. [n s.] \Vitnesses:

\V. M. Snrrn, (ans. 1*]. Kmmv.

